Coefficient of Conservatism:
Coefficient of Wetness:
B. S. Slaughter
A species of moist meadows and shores; collected from Keweenaw Co. by O. A. Farwell several times from 1890 to 1942, but none of his labels have habitat data. He does note early on (1904): "The only place I have found it is at Mt. Houghton near the northern end of the Keweenaw Peninsula" but some of his later specimens came from the Lake Superior shore. It is mysterious that this species, which Farwell apparently collected a number of times, both from ridgetops inland and along the Lake Superior shore, has not been seen recently.
A native boreal and alpine species quite disjunct to the Lake Superior region with a short and relatively thick spike-like panicle. Occasional specimens of P. pratense with short panicles are often misidentified as this species, but differ in having shorter awns and in most or all other characters that tend to distinguish P. pratense: base of culm ± enlarged and bulbous, summit of culm very minutely roughened [20×], ligule usually with distinct notch on each side, sheaths not inflated. In P. alpinum, the base of the culm is not bulbous and the summit is perfectly smooth, the ligule is not notched on both sides, and the upper leaf sheaths are ordinarily somewhat inflated.